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This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

National Institute of Allergy and Infectious Diseases is part of the National Institutes of Health. It provides information about HIV infection and AIDS and funds research to discover new and better treatment and prevention strategies.